An Integrated Circuit (IC) is a modern device filled with
miniaturized electronic components. ICs are found in automobiles, hospital
equipment, robots on mars, video games and computers. Most modern electronic
devices use Integrated Circuits.

The electronic components in an IC are sealed inside on
a tiny "micro-chip". Fine wires connect the microchip to metal
pins along the edge of the IC. These pins are numbered as shown in the
image below.

Use the following circuit diagram to construct a circuit
using an IC.

If you need help with reading a circuit diagram, jump to the Introduction
Page and check out the suggested reading.

R1 - 100K Ohms

R2 - 33k Ohms

R3 - 330 Ohms

C1 - 10 uF

IC1 - 555 Timer

+V 4.8 volts

To avoid overheating of wires and damage to components
we suggest using a resistor in series with your power supply. At Hila we
use four AA rechargeable Nickel Cadmium batteries with a 56 Ohm, 5 watt
resistor. This configuration delivers enough current to drive any of these
projects but limits current in case of a short circuit.